export path

I need to replace special characters with equivalent hexadecimal unicode under Linux or Unix like operating system. How do I list or find out unicodes for given characters?

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How do I see a list of all exported variables and functions under Unix bash shell?

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How do I run a Linux shell script? How can I run a script in Linux operating system using command line options?

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Q. How do I add new path to PATH variable under Linux and UNIX operating system?

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I just need a help to show me how to setup java path on Linux. How can I set JAVA_HOME and PATH variables for every user under my Linux system?

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